S6206 should not report on non-final classes

public class A { // Compliant as it is inherited from
    private final int i;

    public A(final int i) {
        this.i = i;
    }

    public int getI() {
        return i;
    }
}

public class B extends A {
    public B(final int j) {
        super(j);
    }
}

public class NonFinal { // Compliant as it could potentially be inherited from
    private final int i;

    public NonFinal(final int i) {
        this.i = i;
    }

    public int getI() {
        return i;
    }
}

public final class DefinitelyFinal { // Noncompliant
    private final int i;

    public DefinitelyFinal(final int i) {
        this.i = i;
    }

    public int getI() {
        return i;
    }
}